Electrolyte.



BEST. AVAILABLE UNITED m iiiiiililS PATENT OFFICE.

ABRAHAM VAN \YINKLE, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE HANSON dzVAY I WINKL'E COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF N JERSEY.

LELEOTROLYTE.

No. 901,7ac.

erification of Letters Patent.

Patented Oct. 20, 1902.

Apgilication filodbotobcr 24, 1907. Serial No. 398,871.

To all whom it may concern:

Be it known. that l, Ammrimi VAN W 11% 1am, a cl :11 of the UnitedStates, and a rcsidcm: of i )Wfll'li, in the county of Essex and Stan:oi: llcw J have invented a 110W and Improved lilo olytc, of Which. thefollowing a full, (dear, and exact descrip tiou.

The, invention rclatcs to elcctro-chcmisiry, and its object is toprovide a new and improvccfl electrolyte for use in the electrodeposition of zinc on iron and stool, and with a view to increase tlicconductivity of thesclution, to improve lllQ color of the deposit and toinsure a perfect plating, especially of concu vc Sui-faces.

In the present processes for electroplating with zinc, called coldgalvanizing, as distinguished from. the hot process of galvanizing, thofollmving salts are uscd with varying success, namely: sulfate andchlorid of zinc combined with sulfate of aluminum, sulfate of magnesiaand similar combinations.

In order to increase the conductivity of the solution, to improve thecolor of the deposition and to insure a perfect plating, cspcclally ofcurved surfaces or recesses, I use an electrolyte formed of a fluorid ofzinc solution.

in practice, I prefer to saturate thirty per ccul. hydio-iluoric acidwith silica, and then sau ratc this solution with zinc. The. rcsultantliquid is thou diluted with Water to .cut ton per cent. Bauui, and thezinc is slightly neutralized by the addition of a small quantity of analkali, such carbon aloof ammonia.

A good result is'also obtained. by adding slowly to a sulfate of zincsolution, a small quantity of thirty per cont. hydrofluoric acid. 2

The electrolyte may also be formed by saturating; diluted hydrofluoricacid will. zinc and adding a small quantity of Cfll'l'lOl'r of ammonia.In this instance the conductivity of the solution is increased but thereis a tendency to form a sulo-salt on the anodcs. In order to preventthis sub-salt formation and to present clean metallic surface to thesolution, it is desirable to use an anode made of zinc, containing asmall 1. An electrolyte comprising fluorid of zinc in solution.

An electrolyte comprising slightly neut'ralized fiuorid of zinc insolution.

3. An 'eleotrol te omprisinga fiuorid of zinc. solution, and an alkalifor slightly neutralizing the fiuorid of zinc.

4. An electrolyte comprisin a fluorid of zinc solution, and carbonateoFammonia.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ABRAI-IAM VAN WINKLE.

Witnesses I m sc O. STEWART, J. J. lilooizu, Jr.

